Making square holes in wood most often involves a mortising machine. However, the broach, a machinists tool, can accomplish the same function better and more quietly. It will produce a perfectly square, smooth hole as small as 1/8" in any location where a round hole can be drilled providing that the hole is a through hole. Just drill a round hole with a diameter equal to the dimensions of the desired square. Then insert the broach in the hole and either drive it through with a brass hammer or push it through with your drill press, always backing it with a piece of scrap to prevent splintering on the back side. We are introducing these hardened steel broaches in 1/4", 3/8", and 1/2" sizes. If you like them as well as we do, we will add other sizes to the line.